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Replace a memory barrier with a mutex barrier.

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Sponsored by:	The FreeBSD Foundation
This commit is contained in:
rpaulo 2010-08-28 08:13:38 +00:00
parent 707917e57b
commit 37076417ff
1 changed files with 15 additions and 10 deletions
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25
sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c
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@ -208,6 +208,10 @@ static void fasttrap_proc_release(fasttrap_proc_t *);
#define FASTTRAP_PROCS_INDEX(pid) ((pid) & fasttrap_procs.fth_mask)
#if !defined(sun)
static kmutex_t fasttrap_cpuc_pid_lock[MAXCPU];
#endif
static int
fasttrap_highbit(ulong_t i)
{
@ -289,24 +293,17 @@ fasttrap_sigtrap(proc_t *p, kthread_t *t, uintptr_t pc)
static void
fasttrap_mod_barrier(uint64_t gen)
{
#if defined(sun)
int i;
#endif
if (gen < fasttrap_mod_gen)
return;
fasttrap_mod_gen++;
#if defined(sun)
for (i = 0; i < NCPU; i++) {
mutex_enter(&cpu_core[i].cpuc_pid_lock);
mutex_exit(&cpu_core[i].cpuc_pid_lock);
CPU_FOREACH(i) {
mutex_enter(&fasttrap_cpuc_pid_lock[i]);
mutex_exit(&fasttrap_cpuc_pid_lock[i]);
}
#else
/* XXX */
__asm __volatile("": : :"memory");
#endif
}
/*
@ -2326,6 +2323,11 @@ fasttrap_load(void)
for (i = 0; i < fasttrap_procs.fth_nent; i++)
mutex_init(&fasttrap_procs.fth_table[i].ftb_mtx,
"processes bucket mtx", MUTEX_DEFAULT, NULL);
CPU_FOREACH(i) {
mutex_init(&fasttrap_cpuc_pid_lock[i], "fasttrap barrier",
MUTEX_DEFAULT, NULL);
}
#endif
(void) dtrace_meta_register("fasttrap", &fasttrap_mops, NULL,
@ -2450,6 +2452,9 @@ fasttrap_unload(void)
#if !defined(sun)
destroy_dev(fasttrap_cdev);
mutex_destroy(&fasttrap_count_mtx);
CPU_FOREACH(i) {
mutex_destroy(&fasttrap_cpuc_pid_lock[i]);
}
#endif
return (0);